I'll be watching this to see what Menion says.. I was thinking a ride I did a while back didn't have quite as much climbing as Locus said it did. There's always room for bugs (sorry Menion ) but I'd say his algo is fairly simple; every foot you climb it increments the total climb. Even if you're rolling up and down 1 foot 100 times, assuming it's recording all of that data, that's 100 feet of climbing. I certainly could be wrong though.